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प्रश्न
Find the odd one out and give its explanation.
विकल्प
Zinc coating
Tinning
Electroplating
Calcination
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उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
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संबंधित प्रश्न
Name the following:
The property possessed by metals by which they can be beaten into sheets.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Name the most abundant metal in the earth’s crust.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Why does aluminium not corrode right through?
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name two metals which are always found in combined state.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
The two metals which are extracted by means of electrolytic reduction of their molten salts are ______.
Give the principles of electromagnetic separation.
Define the term:
Slag
Name a non- metal that has a metallic luster and sublimes on heating.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Write the name.
The process of extraction of aluminium from alumina-
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Complete flow chart given below.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
